Daikin EUWAC8FZW1 Installation And Operation Manual page 17

Symptom 4: One of the following safety devices is activated
Symptom 4.1: Overcurrent relay of compressor
P
OSSIBLE CAUSES
Failure of one of the phases.
Voltage too low.
Overload of motor.
RESET
Symptom 4.2: Low pressure switch or anti-freeze alarm
P
OSSIBLE CAUSES
Water flow to water heat exchanger
too low.
Shortage of refrigerant.
Unit is working out of its operation
range.
Inlet temperature to the water heat
exchanger is too low.
Flow switch is not working or no
water flow.
RESET
Symptom 4.3: High-pressure switch
P
OSSIBLE CAUSES
Condenser fan does not operate
properly.
In case the factory pulley setting has
been changed, it is possible that the
used pulley setting with lower airflow
does not allow optimal working.
Dirty or partially blocked condenser.
Inlet air temperature of the
condenser is too high.
RESET
Symptom 4.4: Fan thermal protector is activated
P
OSSIBLE CAUSES
Mechanical failure (fan is blocked).
Air flow in the unit too low or outdoor
temperature too high.
RESET
Symptom 4.5: Reverse phase protector is activated
P
OSSIBLE CAUSES
Two phases of the power supply are
connected in the wrong phase
position.
One phase is not connected
properly.
RESET
EUWAC5~10FZ
Packaged air-cooled water chillers
4PW14037-1D
C
ORRECTIVE ACTION
Check fuses on the supply panel or
measure the supply voltage.
Measure the supply voltage.
Reset. If the failure persists, call your
local Daikin dealer.
Push the red button on the over-
current relay inside the switch box.
The controller still needs to be reset.
C
ORRECTIVE ACTION
Increase the water flow.
Check for leaks and refill refrigerant,
if necessary.
Check the operation conditions of
the unit.
Increase the inlet water temperature.
Check the flow switch and the water
pump.
After pressure rise, the low pressure
switch resets automatically, but the
controller still needs to be reset.
C
ORRECTIVE ACTION
Check that the fans turn freely. Clean
if necessary.
Reduce the pulley setting back grad-
ually towards the factory setting until
the problem is solved.
Remove any obstacle and clean
condenser coil using brush and
blower.
The air temperature measured at the
inlet of the condenser should not
exceed 43°C.
After pressure decrease, the high
pressure switch resets automatically,
but the controller still needs to be
reset.
C
ORRECTIVE ACTION
Check that the fan rotates freely.
Clean the air heat exchanger
properly.
After temperature decrease, the
thermal protector is reset
automatically.
If the protector is activated
frequently, replace the motor or call
your local Daikin dealer.
C
ORRECTIVE ACTION
Invert two phases of the power
supply (by licensed electrician).
Check the connection of all phases.
After inverting two phases or fixing
the power supply cables properly,
the protector is reset automatically,
but the controller still needs to be
reset.
Symptom 4.6: Discharge thermal protector is activated
P
OSSIBLE CAUSES
Unit is working outside the operation
range.
RESET
Symptom 4.7: Flow switch is activated
P
OSSIBLE CAUSES
No water flow.
RESET
Symptom 5: Unit stops soon after operation
P
OSSIBLE CAUSES
One of the safety devices is
activated.
Voltage is too low.
Symptom 6: Unit runs continuously and the water temperature remains
higher, respectively lower than the temperature set on the controller
P
OSSIBLE CAUSES
The temperature setting on the
controller is too low.
The heat production in the water
circuit is too high.
Water flow is too high.
Symptom 7: Excessive noises and vibrations of the unit
P
OSSIBLE CAUSES
Unit has not been fixed properly.
The flexible connections between
the ducting flanges of the unit and
the ducts are not installed or are
worn out.
Symptom 8: Water drips out of the unit
P
OSSIBLE CAUSES
Blocked drain pipe.
Symptom 9: Continuous switching between high and low fanspeed
P
OSSIBLE CAUSES
In case the factory pulley setting has
been changed, it is possible that the
used pulley setting with lower airflow
does not allow optimal working.
C
ORRECTIVE ACTION
Check the operation condition of the
unit.
After temperature decrease, the
thermal protector resets
automatically but the controller still
needs to be reset.
C
ORRECTIVE ACTION
Check the water pump.
After finding the cause, the flow
switch is reset automatically, but the
controller still needs to be reset.
C
ORRECTIVE ACTION
Check safety devices (refer to "One
of the following safety devices is
activated" on page 14).
Test the voltage in the supply panel
and, if necessary, in the electrical
compartment of the unit (voltage
drop due to supply cables is too
high).
C
ORRECTIVE ACTION
Check and adjust the temperature
setting.
The cooling capacity of the unit is too
low. Call your local Daikin dealer.
Recalculate the water flow.
C
ORRECTIVE ACTION
Fix the unit as described in the
chapter "Installing the unit".
Check the air ducts and fix them
properly as described in the chapter
"Installing the unit", or install flexible
ducts.
C
ORRECTIVE ACTION
Check the drain outlet and clean it, if
necessary.
C
ORRECTIVE ACTION
Reduce the pulley setting back grad-
ually towards the factory setting until
the problem is solved.
Installation and operation manual
14